problem with lambda / closures

[Terry Reedy]

Jussi Piitulainen wrote:
> Terry Reedy writes:
> 
>> definitions. Lambda expressions create functions just like def
>> statements and are not closures and do not create closure unless
>> nested within another function definition. Thinking otherwise is
> 
> Seems quite closed in the top level environment to me:
> 
>    Python 2.3.4 (#1, Jul 16 2009, 07:03:37) 
>    >>> k = 'outer'
>    >>> f = lambda : k
>    >>> def test():
>    ...   k = 'inner'
>    ...   return f()
>    ... 
>    >>> test()
>    'outer'
>    >>> k = 'thing'
>    >>> test()
>    'thing'

I used closure in the same sense as the OP, who would have expected the 
last result to be 'outer', not 'thing'. Runtime lookup in the lexically 
defined global namespace is normal function behavior, not special 
closure behavior as most people mean is.

Terry Jan Reedy